Constant expansion is not possible. Everything reaches its limits and the wise always try to identify these limits. In the environment, they do not willfully expand civilization at the expense of natural wilderness. In economics, they do not spend beyond the market. In personal relationships, they do not demand more than others can fairly give. In exercise, they do not strain beyond their capacities. In health, they do not go beyond the limits of their age. With such attitudes, the wise can even exploit what others think to be barriers.

When one senses that one has come to the limits of the time and situation, one should conserve one’s energy. Often, this will be in preparation for a challenge to the limits, or a changing over to a new set of constraints. Whenever one comes upon the circumference, it is best to consider carefully and marshal one’s resources before crossing the line. There is always uncertainty, and we must be wary.

We can also utilize limits for our own purposes. We can trap someone because we know of the limits ahead. Defense is possible by utilizing given limits, as a wall protects our backs in a fight. Work is easier when we know that we will be working for a limited time. We can take advantage of opportunities because we know that they are only there for the moment. Limitations should not always be seen as negative constraints. They are the geography of our situation, and it is only right to take advantage of this.